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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Consider and elevator moving downwards with an acceleration a. The force exerted by a passenger of mass m on the floor of the elevator

    A)  \[ma\]                

    B)         \[ma-mg\]

    C)  \[mg-ma\]          

    D)         \[mg+ma\]

    Correct Answer: C

    Solution :

     The force which the passenger exerts on the floor of the elevator is equal to the force of reaction which the floor exerts on the passenger. Now, we know that in the lift moving downwards with acceleration\[a\],                 \[Mg-R=Ma\] or                     \[R=M(g-a)\]


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